화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.18, No.1, 67-72, January, 2010
DOI10.1007/s13233-009-0119-7  Export Citation
High In-Plane Alignment of Liquid Crystalline Methacrylate Copolymers Bearing Photoreactive 2-Styrylpyridine and Mesogenic 4-Methoxybiphenyl Groups
Giseop Kwak, Hyeryun Kim, Min-Woo Kim, Seok-Hee Hyun, Chang-Hoon Baek, Woo-Sik Kim†, Hak-Sang Im1, and Il-Ryon Jeon2
  • Department of Polymer Science, Kyungpook National University, Daegu, 702-701, Korea
  • 1Department of Biological & Environment Engineering, Semyung University, Chungbuk, 390-711, Korea
  • 2School of Fire & Disaster Prevention, Kyungil University, Daegu, 712-791, Korea
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This paper describes the thermally enhanced in-plane alignment and other properties of liquid crystalline (LC) copolymers (1, 2, and 3) consisting of a methacrylate with a 2-styrylpyridine side group as a photocyclodimerizable group and a methacrylate with a methoxy biphenyl side group as a mesogenic group. H-1 NMR spectroscopy indicated that the contents of the photoreactive monomer unit in copolymers 1, 2, and 3 were 0.65, 0.46 and 0.19 (mole fraction), respectively. The copolymers in the film showed a transmittance of 92% at wavelengths > 450 nm, even at 100 degrees C, as well as thermal stability up to approximately 360 degrees C. Copolymers 1 and 2 gave a nematic texture at 155 and 150 degrees C, respectively, while copolymer 3 showed a smectic texture at 130 degrees C. The copolymer films aligned parallel to the linearly polarized UV(LPUV) light after LPUV light irradiation and subsequent thermal annealing. The respective in-plane order parameters of copolymers 1, 2, and 3 in the film at 315 nm were 0.65 at 0.001 J/cm(2), 0.59 at 0.01 J/cm(2), and 0.48 at 0.025 J/cm(2) by the same treatment in the LC temperature ranges. This suggests that the photoreactive LC copolymers not only have high optical transparency and good thermal stability but also have controllable, high in-plane alignment with the contents of the photoreactive monomer unit.
Keywords:annealing;in-plane alignment;liquid crystalline methacrylate copolymer;2-styrylpyridine;transparency
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